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mm: smaps*: extend smap_gather_stats to support specified beginning 

Extend smap_gather_stats to support indicated beginning address at which
it should start gathering.  To achieve the goal, we add a new parameter
@start assigned by the caller and try to refactor it for simplicity.

If @start is 0, it will use the range of @vma for gathering.

Signed-off-by: Chinwen Chang <chinwen.chang@mediatek.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Steven Price <steven.price@arm.com>
Cc: Michel Lespinasse <walken@google.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Daniel Jordan <daniel.m.jordan@oracle.com>
Cc: Daniel Kiss <daniel.kiss@arm.com>
Cc: Davidlohr Bueso <dbueso@suse.de>
Cc: Huang Ying <ying.huang@intel.com>
Cc: Jason Gunthorpe <jgg@ziepe.ca>
Cc: Jimmy Assarsson <jimmyassarsson@gmail.com>
Cc: Laurent Dufour <ldufour@linux.ibm.com>
Cc: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Cc: Matthias Brugger <matthias.bgg@gmail.com>
Cc: Song Liu <songliubraving@fb.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Link: http://lkml.kernel.org/r/1597715898-3854-3-git-send-email-chinwen.chang@mediatek.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Chinwen Chang 2020-10-13 16:53:43 -07:00 committed by Linus Torvalds
parent 07e5bfe651
commit 03b4b11493
1 changed files with 22 additions and 8 deletions
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30
fs/proc/task_mmu.c
View File

@ -721,9 +721,21 @@ static const struct mm_walk_ops smaps_shmem_walk_ops = {
.pte_hole = smaps_pte_hole,
};
/*
* Gather mem stats from @vma with the indicated beginning
* address @start, and keep them in @mss.
*
* Use vm_start of @vma as the beginning address if @start is 0.
*/
static void smap_gather_stats(struct vm_area_struct *vma,
struct mem_size_stats *mss)
struct mem_size_stats *mss, unsigned long start)
{
const struct mm_walk_ops *ops = &smaps_walk_ops;
/* Invalid start */
if (start >= vma->vm_end)
return;
#ifdef CONFIG_SHMEM
/* In case of smaps_rollup, reset the value from previous vma */
mss->check_shmem_swap = false;
@ -740,18 +752,20 @@ static void smap_gather_stats(struct vm_area_struct *vma,
*/
unsigned long shmem_swapped = shmem_swap_usage(vma);
if (!shmem_swapped || (vma->vm_flags & VM_SHARED) ||
!(vma->vm_flags & VM_WRITE)) {
if (!start && (!shmem_swapped || (vma->vm_flags & VM_SHARED) ||
!(vma->vm_flags & VM_WRITE))) {
mss->swap += shmem_swapped;
} else {
mss->check_shmem_swap = true;
walk_page_vma(vma, &smaps_shmem_walk_ops, mss);
return;
ops = &smaps_shmem_walk_ops;
}
}
#endif
/* mmap_lock is held in m_start */
walk_page_vma(vma, &smaps_walk_ops, mss);
if (!start)
walk_page_vma(vma, ops, mss);
else
walk_page_range(vma->vm_mm, start, vma->vm_end, ops, mss);
}
#define SEQ_PUT_DEC(str, val) \
@ -803,7 +817,7 @@ static int show_smap(struct seq_file *m, void *v)
memset(&mss, 0, sizeof(mss));
smap_gather_stats(vma, &mss);
smap_gather_stats(vma, &mss, 0);
show_map_vma(m, vma);
@ -852,7 +866,7 @@ static int show_smaps_rollup(struct seq_file *m, void *v)
hold_task_mempolicy(priv);
for (vma = priv->mm->mmap; vma; vma = vma->vm_next) {
smap_gather_stats(vma, &mss);
smap_gather_stats(vma, &mss, 0);
last_vma_end = vma->vm_end;
}